IP Convergence: Beyond VoIP, Beyond Cost Savings

Establishing QoS on Office Communicator *SHOULD* be possible once you determine which ports Office Communicator uses for it's RTP streams. Once that is determined then you can set up an ACL in the router to look for that port, assign that to a class map that will mark those packets with the proper TOS bit.

That being said, an excerpt from Microsoft:

Audio and video

loadTOCNode(2, 'moreinformation');Audio uses a pair of User Datagram Protocol (UDP) ports for a Real-time Protocol (RTP) stream to transmit data. Video uses Real-time Transport Protocol (RTCP) to control the session stream.

By default, the ports that are used are dynamic. However, the ports can be controlled through Group Policy registry settings. These registry settings are under the following registry key:

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Communicator\PortRange

You can use the following policies to control the port usage.

Policy	Description	Default	Min	Max
MinMediaPort	Specifies the lowest port that is used for Audio and Video signaling	5350	1024	65535
MaxMediaPort	Specifies the highest port that is used for Audio and Video signaling	5353	1024	65535

Important The following settings do not work in Office Communicator. These settings are listed in the Comunicator.ADM file, but they do not work.

Policy	Description	Default	Min	Max
MinSipDynamicPort	Specifies the lowest port that is used for SIP	7100	1024	65535
MaxSipDynamicPort	Specifies the highest port that is used for SIP	7103	1024	65535